OK, I can agree with that. Throughout the translated version of the Bible, the word “nature” typically means our current condition and not our purpose, so let me just switch out that word.
This wording “permanently finding” is still a bit awkward, not exactly sure what is meant there.
Yes, we are incapable of being good is my assertion, regardless of what purpose that was set for us. All have sinned and fallen short of the glory of God. (Romans 3:23)
The Bible shows how man is utterly incapable of keeping these rules (the 10 commandments should should suffice to prove our guilty). Except Jesus, who lived perfectly, “fulfilling the law”. He doubled down and said it’s not good enough to avoid adultery, you must avoid lust as well.